Protons have a ................ charge
The mass of an electron is ................
A molecule has two or more atoms that are ................ bonded together.
Protons, neutrons and electrons are called ............... particles
Isotopes of the same element have the same number of .............
The number of protons in the nucleus of an atom is called the ....... number
The sum of the number of protons and neutrons in the nucleus of an atom is called the ............. number
The element with 13 protons and 14 neutrons is called .............
Particles in it can slide past one another
Particles in it are in rows, close together
Protons and neutrons made up the ........ of the atom
The negatively charged particle in the electron cloud.
A particle in the nucleus that is positively charged
A particle in the nucleus with a neutral, or no charge
A tiny, dense positively charged region in the center of an Atom
Particles, like protons, neutrons, and electrons that are smaller than atoms
Regions inside the Atom where electrons are likely to be found. This model developed by Schrodinger, is called Quantum Theory
The number of protons in an element
The average of the masses the neutrally occurring isotopes in element
The arrangement of elements on a table based on their atomic number
A column on the periodic table, also called a family containing elements with the same number of Valence electrons
one of a hundred or so pure substances that cannot be broken down into simpler substances
Creator of the Periodic Table
When two or more compounds are joined together.
Diagram of Elements
Rows on the Periodic Table
Number of Protons in an Element
Chemistry that relates to non carbon compounds.
A substance with just one type of atom.
The place where Protons and Neutrons are housed
Group 18. These elements do not mix well with others.
How quick it is to join up with other elements.
A type of mixture that you cannot pick apart. A solution.
A type of mixture that you can pick apart.
A negatively charged particle.
Element with 2 protons.
positively charged particle.
A type of chemistry that involves carbon based life forms.
A particle that has no charge.
When two elements bond together.
Electrons are located around the nucleus in an electron what?
The point at which a solid turns to a liquid.
Point at which a liquid is turned into a gas.
Same number of protons different number of neutrons.
Al things that have mass and volume.
The lightest element known
Number of protons in the nucleus of an atom
A stable subatomic particle
A cloudlike group of electrons
A substance consisting of atoms which all have the same number of protons
The time required for a quantity to reduce to half its initial value
Any one of various forms in which the atoms of a chemical element can occur
The total number of protons and neutrons in a nucleus
A subatomic particle of about the same mass as a proton but without an electric charge
A very small particle of matter that is part of the nucleus of an atom and that has a positive electrical charge
A solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity
An element or substance that is not a metal
A nonmetal that can combine with a metal to form an alloy
The smallest particle of a substance that can exist by itself or be combined with other atoms to form a molecule
The smallest unit of an element that maintains the properties of that element.
A subatomic particle that has no change and that is found in the nucleus of an atom.
A region around the nucleus of an atom whose electrons are likely to be found.
A unit of mass that describes the mass of an atom or molecule.
An atom's central region, which is made up of protons and neutrons.
An atom that has the same number of protons/atomic number as other atoms of the same element do but that has a different number of neutrons/atomic mass.
The mass of an atomn expressed in atomic mass units.
A subatomic particle that has a positive charge and that is found in the nucleus of an atom.
A subatomic particle that has a negative charge.
The sum of the number of protons and neutrons in the nucleus of an atom.
The number of protons in the nucleus of an atom; the atom's number is the same for all atoms of an element.
Plays in radioactive atoms that changes a neutron to a proton or electron.
A type of physical that occurs between electrically charged particles.
The force that holds particles together in the atomic nucleus.
A force that attracts any objects with mass.
the smallest particle of an element
the center of an atom
a positively changed particle in the nucleus of an atom
a neutral particle in the nucleus of an atom
a negatively changed particle
an electron in the outermost energy level of an atom
the properties of elements tent to repeat in a regular an pattern
a horizontal row of elements
another word for family
a quantity equal to one 1/12 the mass of a carbon
the number of protons in the nucleus of an atom
the element that are usually poor conductors
the element that are good conductors of heat and electricity
an element that has properties of both a metal and non-metal
any atom that have the same number of protons but a different number of neutrons
another word for atomic mass unit
Negative charge of an atom
Center part of an atom that holds protons and neutrons
Positive charge of an atom
Neutral Charge of an atom
Area in an atom where an electron is found
Substance that cannot be broken down into smaller parts
Number or protons in an atom
Atoms of the same element that have different amounts of neutrons
Average mass of an element's isotopes
Chart that shows the elements
When 2 or more elements combine
Atom that is no longer neutral because of gained/lost electrons
Chemical bond by sharing of valence electrons
Chemical Reaction that releases energy
Chemical reaction that absorbs energy
Substance that speeds up a chemical reaction
Symbol for Iron
Vertical columns on the Periodic Table are called
Horizontal rows on the Periodic Table are called
the smallest component of an element
Dense, positively charged mass at the center of an atom.
Positively charged subatomic particle found in the nucleus.
Neutral subatomic particle found in the nucleus.
Negatively charged subatomic particle found outside the nucleus.
The sum of the protons and neutrons in the nucleus of an atom.
This number identifies the element and is equal to the number of protons found in the nucleus.
An atom with a charge (unequal number of protons and electrons)
Versions of the same element with different numbers of neutrons.
The possible energies that an electron in an atom can have.
The weighted average mass of all of an element's isotopes' mass numbers (usually a decimal).
A visual model showing the most likely locations for the electrons in an atom.
The arrangement of electrons around the nucleus of an atom.
When all of the electrons in an atom have their lowest possible energies.
the property of a body that causes it to have weight
the property of something that is great in magnitude
a stable particle with positive charge
an elementary particle with negative charge
of or relating to constituents of the atom or forces within the atom
(nontechnical usage) a tiny piece of anything
The "outer energy shell" of and atom
Electrons are "shared" in this type of bond.
Electrons are "stolen" in this type of bond.
The smallest unit of matter with all the properties of that substance.
This matches the number of protons in an atom.
A neutron has a ___________________ charge.
"Like" electric charges ____________________ each other.
A combination of one or more atoms.
The location around the nucleus where electrons orbit.
A charged particle.
A "Family" of elements that do not typically react with other elements.
The "Family" of elements that are very reactive.
Characteristics that are measurable or observable are called physical _____________.
Subtract the atomic number from the atomic mass to find the number of _________________.
Electrons have a ______________________ charge.
Protons have a _________________________ charge.
An abreviated way to name an element.
Other than hydrogen and helium, the number of electrons needed to fill the valence shell.
The center of an atom where the protons and neutrons are located.
An element that can have a variable number of neutrons in its nucleus.
Atoms with full outer energy shells are known to be _______________.
A group of elements with similar properties are known as a _________________.
Reactivity is a ______________________ property.
The elements are organized into this grid.
When elements react they form new _____________________.
This element is found in all organic matter and has four valence electrons.
NaCl is the ___________________________ for salt.
Each ___________________ on the periodic table represents the number of valence electrons in an element.
Each __________ on the Periodic Table represents the number of "energy levels" an element has.
The "electronic connections" between elements in a molecule.
What are positively charged particles of the atom?
What are negatively charged particles of an atom?
What particle of anatom has no charge?
Where are protons found?
Where are electrons found?
An _______ is an atom that has the same number of protons but a different number of neutrons as other atoms of the same element.
The ____ ______ is the total number of protons and neutrons.
What detrmines the identity of an atom?
What is an average of the masses of all naturally occuring isotopes of an element?
The electrons in the outermost energy level of an atom are called _______ _________.
Alkali Metals only have ___ valence electron?
Valence electrons determine the _____ of which an element si placed.
Lithium is a?
Is Flourine a metal or nonmetal?
A ______ loses an electron and becomes positively charged.
A _____ gains an electron and becomes negatively charged.
A row of elements is called a ______.
What are charged particles that form during chemical changes?
What is it called when 2 atoms of nonmetals bond?
What is it called when a metal reacts with a nonmetal?
Who first suggested the existence of the atom
He found that the rays were attracted by positively charged metal plates but repelled by negatively charged ones.
He did not confirm Thomson's model: used gold foil in experiment.
Electrons ---------------- the positively charged nucleus.
His model postulated the existence of energy levels or shells of electrons.
Believed all matter was made from fire, water, air earth.
Sub-atomic particles found in protons and neutrons.
The number of protons and neutrons in an element is -------.
These sub particles are positive.
The sub particles are negatively charged.
On an atomic model electrons are noted on an electron -----------
Protons plus neutrons equal ---------- ---------
The center of an atom is called the ---------.
The number of electrons is the same as an atom's -------- -----------
To find the number of neutrons in an atom, you ------- the number of protons from the atomic mass number for the element.
Atomic mass is usually a ------ number
Matter -------- ------- be created or destroyed.
Isotopes have the same number of protons but a --------- number of neutrons.
Only ----- electrons can be in the inner most orbit.
Each element has its own --------
This microscope can be used to see an atom
The ------- -------- shows the organization of all known elements
You find the ---------- atomic mass of isotopes to determine atomic weight o that element
The symbol for gold is
The symbol for hydrogen is -----
Calcium has --------- protons.